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| 北京雾、霾天细粒子质量浓度垂直梯度变化的观测 | |
| 引用本文： | 樊文雁,胡波,王跃思,王式功,孙扬.北京雾、霾天细粒子质量浓度垂直梯度变化的观测[J].气候与环境研究,2009,14(6):631-638. |
| 作者姓名： | 樊文雁 胡波 王跃思 王式功 孙扬 |
| 作者单位： | 1. 兰州大学大气科学学院,兰州,730000;中国科学院大气物理研究所,北京,100029 2. 中国科学院大气物理研究所,北京,100029 3. 兰州大学大气科学学院,兰州,730000 |
| 基金项目： | 国家杰出青年基金40525016、国家重点基础研究发展规划项目2007CB407303和北京市环境保护科技项目200608 |
| 摘 要： | 近年来北京城市区域雾霾天气显著增加,不仅严重影响工农业生产和交通运输,还严重影响人体健康.2007年夏秋季节,北京325 m气象塔8、80和240m平台梯度观测结果表明,雾、霾、晴三种典型天气状况大气细粒子质量浓度垂直分布各有特点,雾天(11月5～6日)低层浓度明显偏高,6日从低到高3层PM2.5(空气动力学直径小于等于2.5μ的大气气溶胶)浓度日均值分别为352.6±79.3、224.7±69.0、214.8±32.8 μg·m~(-3);霾天(8月19～20日)细粒子上下混合均匀,19日从低到高3层PM2.5浓度分别为89.8±29.3、88.9±29.8、90.0±31.7 μg·m~(-3);晴天(8月22～23日)细粒子昼夜变化明显,夜间在80 m高度出现明显分层,23日80 m以下平均值为32.6±13.1μg·m~(-3),240 m平均值为27.4±13.5μg·m~(-3).雾天细粒子主要来源于局地,霾天细粒子污染表现为时空分布十分均匀的城市群区域污染特征且污染物积累;连续晴天细粒子明显被清除. |
| 关 键 词： | 雾霾 梯度变化 |
Measurements on the Vertical Distribution of PM2.5 Concentration in Fog and Haze Days in Beijing City |
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| FAN Wenyan,HU Bo,WANG Yuesi,WANG Shigong,SUN Yang.Measurements on the Vertical Distribution of PM2.5 Concentration in Fog and Haze Days in Beijing City[J].Climatic and Environmental Research,2009,14(6):631-638. | |
| Authors: | FAN Wenyan HU Bo WANG Yuesi WANG Shigong SUN Yang |
| Abstract: | Fog and haze days in Beijing are significantly increasmg in recent years, which can influence traffic, in-dustry, and agriculture seriously.Furthermore, the toxicant aerosol particulate can harm human health seriously.In order to identify the vertical distribution of particulate matter with aerodynamic diameter less than 2.5 μm (PM2.5) under different weather conditions, three instruments used for measuring the mass concentration of PM2.5 were installed on 8, 80, and 240 m platform in 325-m Beijing meteorological tower during the summer and autumn of 2007.Results show that there are obvious differences in the vertical distribution of PM2.5 concentration under different weather conditions. During the foggy period (5-6 November) , the daily average PM2.5 concentrations at 8, 80, and 240 m were 352.6±79.3, 224.7±69.0, and 214.8±32.8 μg · m~(-3) , respectively, on 6 November, the PM2.5 concentration altered obviously. In haze days (19-20 August) , PM2.5 mixed uniformly, the daily average concentrations at 8, 80, and 240 m were 89.8±29.3, 88.9±29.8, and 90.0±31.7 μg· m~(-3) on 19 August. During the sunny days (22-23 August) , the concentrations of PM2.5 show a very distinct diural variation There was an obvious vertical layer structure, especially at night. The aerosol mixed uniformly on 23 August. The daily average PM2.5 concentrations for 8-80 m and 240 m were 32.6±13.1 and 27.4±13.5 μg · m~(-3) , respectively. The particles of fog were mainly from local sources.However, the particles of haze were maily from regional sources, and showed an increasing trend in concentration There was an elimination process of PM2.5 during the continuous fine days. |
| Keywords: | PM2 5 fog haze PM2 5 vertical distribution |
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